Method for evaluating bending rigidity damage degree of plate girder bridge plate

A technology of bending stiffness and damage degree, which is applied in the field of bridge structure evaluation in civil engineering, can solve problems such as difficult to give damage degree, unreliable, and impossible to evaluate the damage degree of the plate

Active Publication Date: 2014-06-11
SHANGHAI TONGHAO CIVIL ENG CONSULTING
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Problems solved by technology

For the evaluation of hinge joint damage, the visual method is generally used in engineering, and the damage degree of the hinge joint is judged by manually checking whether the hinge joint is cracked or water seepage. reliable
The applicant once proposed "a method for evaluating the damage degree of hinge joints of sla...

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  • Method for evaluating bending rigidity damage degree of plate girder bridge plate
  • Method for evaluating bending rigidity damage degree of plate girder bridge plate
  • Method for evaluating bending rigidity damage degree of plate girder bridge plate

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with accompanying drawing and embodiment, but present embodiment is not intended to limit the present invention, and every adopt similar structure and method of the present invention and similar changes thereof, all should be included in the protection scope of the present invention.

[0044] The bridge selected in the embodiment is a single-span simply supported plate girder structure, such as figure 1 , figure 2 shown. The calculated span is 11.0m, and the cross section is composed of 10 hollow slabs hinged, numbered from left to right respectively 1 to 10, cross section see image 3 . The slab width is 0.99m, the slab height is 0.55m, the center-to-center distance between adjacent slabs is 1.00m, and the concrete grade is C40.

[0045] Two 30-ton trucks are used for loading, and the wheels are arranged near the hinge joint. The loading is divided into three working conditions, and the differenc...

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Abstract

The invention relates to a method for evaluating the bending rigidity damage degree of a plate girder bridge middle plate. According to the mutual interaction and the influence of the bending rigidity of each plate, the hinge joint rigidity and the displacement of each plate edge on the plate bending rigidity damage degree, a relationship formula among the bending rigidity, the hinge joint rigidity and the displacement of each plate edge is built, a plurality of loads and the load eccentricity are considered, and the bending rigidity damage degree of the plate is quantificationally judged through calculating the damage coefficient Beta i of each plate; when the Beta i is equal to 1, the plate is undamaged, and when the Beta i is equal to 0, the plate is completely damaged. The method has the advantages that the bending rigidity damage degree of the plate can be quantificationally judged, the influence of subjective factors is avoided, the method is applicable to the automobile loading, and the optimal estimation value of the bending rigidity parameters of the plate is given out according to several groups of experiments.

Description

technical field [0001] The invention relates to a method for evaluating the damage degree of the flexural rigidity of a slab girder bridge slab, belonging to the technical field of bridge structure evaluation in civil engineering. Background technique [0002] The slabs of the prefabricated slab girder bridge are prefabricated, and the slabs are connected by hinge joints. For slab girder bridges, damage generally occurs at the hinge joints first. With the further development of the damage, especially when the slab girder enters the single-slab stress state, the slab itself will also be damaged. Therefore, the damage of the hinge joint and the damage of the slab will exist at the same time. The damage of the board is generally reflected in the bending stiffness of the board, and has little influence on the torsional stiffness. The damage of the board in the present invention refers to the damage of the bending rigidity of the board. The damage of the slab has a great influe...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 周正茂田清勇袁桂芳
Owner SHANGHAI TONGHAO CIVIL ENG CONSULTING
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